Noizio - Feeling that the noise of the big city is too much for you to bear?

Generative.fm - Endlessly unique ambient music

Defonic - Create a unique sound environment at home or in the office

Silenz - Mix ambient noise in with the music you're listening to

Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.

Serene - The macOS app to get your focus back